Braking resistance

Function
The dynamic braking function can be enabled by connecting an external braking resistor.
• When an abrupt deceleration is necessary
• When an overvoltage "OP" trip occurs at a deceleration stop
• When the continuous regenerative state, such as moving down of a lifting gear and winding-out operation for tension control, is entered
• When the regenerative state is entered by load fluctuation during constant speed run of a press machine, etc.

To use dynamic braking, set [F304: Dynamic braking, OLr trip] to "1" - "8" (dynamic braking enabled). At this time, the overvoltage limit operation is automatically disabled as in the case of [F305: Overvoltage limit operation] ="1: Disabled", and the regenerative energy of the motor is consumed by a braking resistor.
Set [F308: Braking resistance] and [F309: Braking resistor capacity] according to the braking resistor to be connected.
Set the overload time of braking resistor with [F639: Braking resistor overload time]. Set a value so that a trip occurs at a value 10 times the [F309: Braking resistor capacity] setting.
Set the operation level of dynamic braking with [F626: Overvoltage limit operation level].

To output an overload of braking resistor, allocate the braking resistor overload (OLr) pre-alarm (function number: "30" , "31") to the output terminal.
Be sure to install a thermal relay (THR) to prevent fire.
The inverter is equipped with the functions that protect a braking resistor from overload or overcurrent. A thermal relay needs to be activated when these protective functions become disabled.
Select the appropriate thermal relay (THR) according to the braking resistor capacity (watt).
For an application that requires the continuous regenerative state, such as moving down of a lifting gear, press and tension control, or when a deceleration stop is performed for a machine with large load inertial moment, increase the braking resistor capacity according to the operation rate.
Connect a braking resistor with a resistance value greater than the minimum allowable resistance value (resultant resistance value). Be sure to set [F308: Braking resistance] and [F309: Braking resistor capacity] for overload protection.
To use a braking resistor without thermal fuse, connect a thermal relay to shut off the power.
Use a braking resistor with a resistance value greater than the minimum allowable resistance value (resultant resistance value).

Please reference latest AS3 Instruction Manual more details or latest information.

AS3 fault codes, descriptions, symptoms and suggested remedies can be found in the below links. Each fault code can also be linked to directly from the AS3 by accessing the QR code on a mobile device while the AS3 is currently experiencing the fault.